# System Designer vs PlantUML App

The clearest difference is price: System Designer at Free against PlantUML App's $0.99. System Designer also leads on rating (4.4 vs 3.0) and review sentiment (78% vs 60%). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.

System Designer is free to download; PlantUML App costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

System Designer holds the better App Store score, 4.4 against 3.0. Both are backed by a comparable volume of ratings — 17 and 4 respectively. Written reviews point the same way: 78% of System Designer's written reviews are positive against 60% of PlantUML App's.

System Designer ships an update monthly, PlantUML App every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | System Designer | PlantUML App |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/plantuml-app/id6444164984/reviews) |
| Number of ratings | **17** | 4 |
| Positive reviews | **77.8% of reviews** | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 7 MB | 7 MB |
| Requires iOS | **15.6** | 16.7 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [Bartolomeo Sorrentino](https://appshunter.io/developer/791375856) |

## What reviewers say

### System Designer

[App page](https://appshunter.io/ios/app/system-designer/id1132983280)

Design complex systems using a low-code platform that leverages UML standards. Generate code skeletons and manage components graphically. Run and test your system with dynamic type checking.

**Highlights:** UML-based system modeling, Code skeleton generation, Graphical component creation, MSON format for model definition, Dynamic type checking, Cross-device synchronization via GitHub

**Features:** macOS Compatibility

**In-app purchases:** none


### PlantUML App

[App page](https://appshunter.io/ios/app/plantuml-app/id6444164984)

This native iPad app allows you to create and edit PlantUML diagrams efficiently. It offers AI assistance for drawing and script generation, along with a robust text editor and diagram preview. Requires an OpenAI API key for AI features.

**Highlights:** Create, update, and delete PlantUML documents, AI-powered diagram generation from sketches or text prompts, Syntax highlighting and auto-completion in text editor, Auto-save functionality, Diagram preview with caching, Share diagrams via AirDrop, iCloud, and other apps, iCloud document sharing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is System Designer free?

System Designer is free to download, with no in-app purchases.

### Is PlantUML App free?

PlantUML App costs $0.99, with no in-app purchases.

### Which has better reviews, System Designer or PlantUML App?

System Designer is rated higher. System Designer averages 4.4 out of 5 from 17 ratings, while PlantUML App averages 3.0 from 4 ratings.

### Do System Designer or PlantUML App have ads?

Neither System Designer nor PlantUML App shows ads.

### Which is updated more often, System Designer or PlantUML App?

System Designer ships an update monthly, and PlantUML App every 2 months. Most recently, System Designer was updated on November 2, 2026 and PlantUML App on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*